bluetooth: Add DeviceChanged logging in Device service.

device/bluetooth/adapter.h

 // Copyright 2016 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef DEVICE_BLUETOOTH_ADAPTER_H_
 #define DEVICE_BLUETOOTH_ADAPTER_H_
 
 #include <string>
 
 #include "base/macros.h"
@@ skipping 19 matching lines @@
   void GetDevice(const std::string& address,
                  const GetDeviceCallback& callback) override;
   void GetDevices(const GetDevicesCallback& callback) override;
   void SetClient(mojom::AdapterClientPtr client) override;
 
   // device::BluetoothAdapter::Observer overrides:
   void DeviceAdded(device::BluetoothAdapter* adapter,
                    device::BluetoothDevice* device) override;
   void DeviceRemoved(device::BluetoothAdapter* adapter,
                      device::BluetoothDevice* device) override;
+  void DeviceChanged(device::BluetoothAdapter* adapter,
+                     device::BluetoothDevice* device) override;
 
  private:
   // The current Bluetooth adapter.
   scoped_refptr<device::BluetoothAdapter> adapter_;
 
   // The adapter client that listens to this service.
   mojom::AdapterClientPtr client_;
 
   base::WeakPtrFactory<Adapter> weak_ptr_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(Adapter);
 };
 
 }  // namespace bluetooth
 
 #endif  // DEVICE_BLUETOOTH_ADAPTER_H_